Spoils of War stacks gives massive AS boost

Title, when having at least one stack of Spoils of War sometimes my AS would go nuts without reason. This does not happen if I have 0 stacks. Also, I noticed this happens when minions are below the execute threshold. I assume this happens since I'm ranged and can't execute minions. https://s4.postimg.org/d6h6uh03x/bug1.jpg https://s4.postimg.org/d7r4nw1xp/bug2.jpg
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